Study on the effect of the friction coefficient on the response of structures isolated with friction pendulums

Abstract

The paper presents a study regarding the effect of the friction coefficient on the behavior of structures isolated by friction pendulums. A laboratory-scale structure and its model created in SolidWorks are employed in the research. The excitation, ensured by a shaking table, follows a displacement after sinusoidal and complex rules. The study revealed the frequency at which the chosen friction pendulum assures efficient isolation is higher then 3 Hz irrespective to the friction coefficient. Experimental results coincide with those obtained from simulations.

Dynamic Equilibrium Equations in Unified Mechanics Theory

“…Hence, the Equation (34) contributes to an approach of thermodynamically consistent modelling of such nonlinearities associated with the motion of pendulum-oscillator, without an extended empirical nonlinear model. Further, the applications of the thermodynamically consistent dynamic equilibrium Equation (35) can be extended to study the friction pendulum dampers used in structural isolations [49][50][51] and other friction dampers used as an energy dissipation devices for structures against an earthquake load [52][53][54]. The dynamic equilibrium equation can also be used for investigating frictional dissipation in vibration energy harvesters [55], independent energy dissipation mechanisms in impact-pendulum [56] and in rub-impact events [57], and influence of wear-dust on contacting surfaces or on the dissipation characteristics etc.…”

Comparison of the performance of friction pendulums with uniform and variable radii

“…The isolated structure's 3D geometrical model, described in Fig. 1, is similar to that presented in [19]. The assembly consists of three parts: (1) the rigid structure; (2) the base plate used as a reference; (3) the shaking plate simulating the horizontal trepidation of the earth.…”

“…Our previous studies focused on finding the response of structures isolated with FPs that have different radii, friction coefficients and are subjected to harmonic or random excitation [19]. Experiments are also made on a special shaking table developed in our laboratory [20].…”